Lump

If you don't like it, you may lump it. Whether you like to do
it or not, no matter; it must be done. Here
“lump it” means “to gulp it down,” or swallow unwillingly, to put up
with it unwillingly but of necessity. Thus we say of medicine, “lump it
down,” i.e. gulp it down. (Danish, gulpen, to swallow.)